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/* $NetBSD: err.h,v 1.3 2019/04/16 10:00:04 mrg Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUX_ERR_H_
#define _LINUX_ERR_H_
/* XXX Linux uses long and int inconsistently here. Hope this works out. */
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/systm.h>
#define MAX_ERRNO 4095
static inline bool
IS_ERR_VALUE(uintptr_t n)
{
return (n >= (uintptr_t)-MAX_ERRNO);
}
static inline void *
ERR_PTR(long error)
{
KASSERT(error < 0);
return (void *)(intptr_t)error;
}
static inline long
PTR_ERR(const void *ptr)
{
KASSERT(ptr == (void *)(intptr_t)(long)(intptr_t)ptr); /* XXX Hurk! */
return (long)(intptr_t)ptr;
}
static inline bool
IS_ERR(const void *ptr)
{
return IS_ERR_VALUE((uintptr_t)ptr);
}
static inline bool
IS_ERR_OR_NULL(const void *ptr)
{
return ((ptr == NULL) || IS_ERR(ptr));
}
static inline void *
ERR_CAST(void *ptr) /* XXX Linux declares with const. */
{
return ptr;
}
static inline long
PTR_ERR_OR_ZERO(const void *ptr)
{
return (IS_ERR(ptr)? PTR_ERR(ptr) : 0);
}
#define PTR_RET PTR_ERR_OR_ZERO
#endif /* _LINUX_ERR_H_ */
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